Compilare: user.cpp: In function ‘int main()’: user.cpp:2:65: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] int v[46336],A,B,s,p,i,j;int main(){freopen("nasa.in","r",stdin);freopen("nasa.out","w",stdout);scanf("%d%d",&A,&B);s=B-A+1;for(i=2;i*i<=B;i++){p=i*i;if(!v[i]){for(j = p;j<=46335;j+=p)v[j]=-1;for(j=i;j<=46335;j+=i)if(v[j]>=0)v[j]++;s-=B/p;s+=(A-1)/p;}else if(v[i]%2==0)s+=B/p,s-=(A-1)/p;else if(v[i]>=1)s-=B/p,s+=(A-1)/p;}printf("%d\n",s);return 0;} ^ user.cpp:2:96: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] int v[46336],A,B,s,p,i,j;int main(){freopen("nasa.in","r",stdin);freopen("nasa.out","w",stdout);scanf("%d%d",&A,&B);s=B-A+1;for(i=2;i*i<=B;i++){p=i*i;if(!v[i]){for(j = p;j<=46335;j+=p)v[j]=-1;for(j=i;j<=46335;j+=i)if(v[j]>=0)v[j]++;s-=B/p;s+=(A-1)/p;}else if(v[i]%2==0)s+=B/p,s-=(A-1)/p;else if(v[i]>=1)s-=B/p,s+=(A-1)/p;}printf("%d\n",s);return 0;} ^ user.cpp:2:116: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int v[46336],A,B,s,p,i,j;int main(){freopen("nasa.in","r",stdin);freopen("nasa.out","w",stdout);scanf("%d%d",&A,&B);s=B-A+1;for(i=2;i*i<=B;i++){p=i*i;if(!v[i]){for(j = p;j<=46335;j+=p)v[j]=-1;for(j=i;j<=46335;j+=i)if(v[j]>=0)v[j]++;s-=B/p;s+=(A-1)/p;}else if(v[i]%2==0)s+=B/p,s-=(A-1)/p;else if(v[i]>=1)s-=B/p,s+=(A-1)/p;}printf("%d\n",s);return 0;} ^